Calibration is the process of establishing the relationship between a measuring device and the units of measure. This is done by comparing a device or the output of an instrument to a standard having known measurement characteristics. For example the length of a stick can be calibrated by comparing it to a standard that has a known length. Once the relationship of the stick to the standard is known the stick is calibrated and can be used to measure the length of other things.
For many operations the quality of the calibration needs to be known and is quantified by an uncertainty estimate for the calibration. This is so important for the scientific community and manufacturing operations that it has been proposed that an evaluation of the measurement uncertainty was added as part of the calibration process.
Quality management systems call for an effective metrology system which includes formal, periodic, and documented calibration of all measuring instruments. ISO 9000 and ISO 17025 require effective calibration systems.
In non-specialized use, calibration is often regarded as including the process of adjusting the output or indication on a measurement instrument to agree with value of the applied standard, within a specified accuracy. For example, a thermometer could be calibrated so the error of indication or the correction is determined, and adjusted (e.g. via calibration constants) so that it shows the true temperature in Celsius at specific points on the scale.
To communicate the quality of a calibration the calibration value is often accompanied by a traceable uncertainty statement to a stated confidence level. This is evaluated through careful uncertainty analysis.
Calibration Management Software helps accelerate lab operations.(New Fluke Manual MET/ CAL[R] Calibration Management Software Helps Speed Cal Lab Operations)
May 20, 2010; Offering database-driven application addressing mechanical and dimensional workload, Manual MET/CAL[R] serves calibration...
Calibration Management Software automates calibration workload.(Fluke Calibration Introduces MET/ CAL[R] Plus Calibration Management Software Version 8.0)
Feb 03, 2012; Comprising MET/CAL for automated calibration and MET/TRACK[R] for test and measurement asset management, MET/CAL[R] Plus...
Calibration made easier: suppliers are using the Internet to reduce the paperwork and the costs of calibration.(Quality Measurement)(Starrett Calibration Services Inc.)
Mar 01, 2004; The papers can cram a filing cabinet, bulge a storage box, or fill up a hard drive, and still they keep coming. The records are...